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Gong B, He E, Van Gestel CAM, Tang Y, Yang W, Yang J, Li Y, Qiu H. Dynamic interaction processes of rare earth metal mixtures in terrestrial organisms interpreted by toxicokinetic and toxicodynamic model. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126281. [PMID: 34111748 DOI: 10.1016/j.jhazmat.2021.126281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/14/2021] [Accepted: 05/29/2021] [Indexed: 06/12/2023]
Abstract
Despite the progress in explanation of mixture toxicity of rare earth elements (REEs), a large knowledge gap still exists in interpreting their mixed effects from a dynamic perspective. Here, we investigated the effects of La-Ce mixtures in Enchytraeus crypticus at different exposure times. The single and mixture toxicity of La and Ce increased with time, as reflected by the reduced LC50/MT50 values. With concentration addition as the reference model, the interactions between La and Ce were quantified by MIXTOX modelling tool, showing a time-dependent pattern with antagonistic effect after 1 and 2 d but additive effects afterwards. The dynamic accumulation and toxicity of La/Ce in organisms exposed to REE mixtures was fitted using a process-based toxicokinetic and toxicodynamic (TK-TD) model to unravel how the elements interacted. Generally, the estimated uptake, elimination, and damage rate constants of La/Ce declined with increasing level of each other, suggesting inhibited uptake and subsequently reduced toxicity of La/Ce due to competition effect. The interplay of La and Ce in TK and TD processes seemed responsible for the observed antagonism. Our study showed that mixture toxicity and interaction of REEs are time-dependent processes and application of TK-TD model may provide more insight into this dynamic effect.
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Affiliation(s)
- Bing Gong
- School of Geographic Sciences, East China Normal University, Shanghai 200241, China; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Erkai He
- School of Geographic Sciences, East China Normal University, Shanghai 200241, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China.
| | - Cornelis A M Van Gestel
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
| | - Yetao Tang
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Wenjun Yang
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, China
| | - Jing Yang
- School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Ye Li
- School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Hao Qiu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Perlatti F, Martins EP, de Oliveira DP, Ruiz F, Asensio V, Rezende CF, Otero XL, Ferreira TO. Copper release from waste rocks in an abandoned mine (NE, Brazil) and its impacts on ecosystem environmental quality. CHEMOSPHERE 2021; 262:127843. [PMID: 32777614 DOI: 10.1016/j.chemosphere.2020.127843] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 07/23/2020] [Accepted: 07/25/2020] [Indexed: 06/11/2023]
Abstract
This study aimed to estimate the impact of an abandoned copper (Cu) mine on ecosystem environmental quality, using integrated ecological and biogeochemical analyses. Through a controlled experiment, the amount of Cu released by waste rocks, Cu adsorbed in soils, Cu geochemical behaviour and its leached amount were measured. Furthermore, to investigate the impacts of mine drainage on the adjacent ecosystem, samples of sediments, water and aquatic macroinvertebrates were analysed. We found that waste rocks still have high Cu concentration even after 30 years under weathering, ranging from 7782 to 8717 mg kg-1, associated mainly with carbonates, amorphous oxides and sulphides. It was estimated that 7.2 tonnes of Cu were released by waste rocks into the environment over last 30 years. The concentration of Cu observed in Ubari stream water was (<dl to 90 μg L-1), in sediments (28.0-1185 mg kg-1) and in macroinvertebrates (1.3-28.9 mg kg-1 d/w). The ecological indexes showed that near mine discharge a significance decrease in the density of aquatic macroinvertebrates and a significance increase of Cu in biological tissues occurs, causing disturbances in biodiversity. The results showed that, even after long periods, the waste rocks from abandoned mines still contain high levels of metal, that are gradually released into the environment through weathering and erosion, representing a potential source of environmental pollution and a clear threat to the environmental quality of adjacent ecosystems.
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Affiliation(s)
- Fabio Perlatti
- Soil Science Department, Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Av. Pádua Dias 11, CEP 13418-900, Piracicaba, SP, Brazil; National Mining Agency - ANM, Rua Loefgren, 2225, 04040-033, São Paulo, SP, Brazil.
| | - Eve Pimentel Martins
- Department of Biology, Federal University of Ceará (UFC), Av. Mister Hull, 2977, 60021-970, Fortaleza, CE, Brazil
| | - Daniel Pontes de Oliveira
- Department of Biology, Federal University of Ceará (UFC), Av. Mister Hull, 2977, 60021-970, Fortaleza, CE, Brazil
| | - Francisco Ruiz
- Soil Science Department, Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Av. Pádua Dias 11, CEP 13418-900, Piracicaba, SP, Brazil
| | - Verónica Asensio
- Soil Science Department, Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Av. Pádua Dias 11, CEP 13418-900, Piracicaba, SP, Brazil
| | - Carla Ferreira Rezende
- Department of Biology, Federal University of Ceará (UFC), Av. Mister Hull, 2977, 60021-970, Fortaleza, CE, Brazil
| | - Xosé Luis Otero
- Department of Edaphology and Agricultural Chemistry, Faculty of Biology, University of Santiago de Compostela - USC, Rua Lopes Gomez de Marzoa, S/n. Campus Sur, Santiago de Compostela, 15782, Spain
| | - Tiago Osório Ferreira
- Soil Science Department, Luiz de Queiroz College of Agriculture, University of São Paulo (ESALQ/USP), Av. Pádua Dias 11, CEP 13418-900, Piracicaba, SP, Brazil
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Wang X, Luo X, Wang Q, Liu Y, Naidu R. Predicting the combined toxicity of binary metal mixtures (Cu-Ni and Zn-Ni) to wheat. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 205:111334. [PMID: 32961486 DOI: 10.1016/j.ecoenv.2020.111334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
In order to investigate and model toxicity and interactions between metals in mixtures, inhibition of wheat root elongation in response to additions of single-metals of copper (Cu), zinc (Zn), and nickel (Ni) and of binary mixed-metal combinations of Cu-Ni and Zn-Ni was tested, using water culture experiments under different Mg concentrations and pH values. A biotic ligand model (BLM) of single-metal Cu, Zn, and Ni was established. The results showed that the toxicity of Cu, Zn or Ni in isolation decreased with increasing Mg concentration whereas the effects of pH on Cu, Zn, or Ni toxicity were related not only to free Cu2+, Zn2+, and Ni2+ concentrations, but also to inorganic metal complexes. In binary mixtures, the two metals in the Cu-Ni mixture showed a weakly antagonistic effect, whereas the two metals in the Zn-Ni mixture showed greater antagonism. Using data from single-metal Cu, Zn, and Ni BLMs, combined with the toxicity index and the overall amounts of metal ions bound to the biotic ligands, one simple model was developed. This model consisted of the toxic unit (TUM, no competition included) and two extended BLMs, BLM-TUf (f as a function of TU, including competition between Mg2+ and metal ions) and BLM-fmix (including the competition between Mg2+ and metal ions, as well as between free metal ions). They were then used to predict the joint toxicity of Cu-Ni and Zn-Ni binary mixtures to wheat. Both of the extended BLMs could provide more accurate predictions of toxic effects of Cu-Ni and Zn-Ni than TUM. BLM-fmix performed best for the Zn-Ni binary mixture (r2 = 0.93; root-mean-square error, RMSE = 9.87). On the other hand, for the Cu-Ni mixture, the predictive effect based on BLM-TUf (r2 = 0.93; RMSE = 9.60) was similar to that of BLM-fmix (r2 = 0.93; RMSE = 9.56). The results provide a theoretical basis for the evaluation and remediation of soils contaminated with mixtures of heavy metals.
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Affiliation(s)
- Xuedong Wang
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China.
| | - Xiaorong Luo
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Qixin Wang
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Yanju Liu
- Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW, 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Callaghan, NSW, 2308, Australia
| | - Ravi Naidu
- Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW, 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Callaghan, NSW, 2308, Australia
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Montañés MT, García-Gabaldón M, Roca-Pérez L, Giner-Sanz JJ, Mora-Gómez J, Pérez-Herranz V. Analysis of norfloxacin ecotoxicity and the relation with its degradation by means of electrochemical oxidation using different anodes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109923. [PMID: 31711779 DOI: 10.1016/j.ecoenv.2019.109923] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 10/28/2019] [Accepted: 11/03/2019] [Indexed: 05/21/2023]
Abstract
In this work, ecotoxicological bioassays based on Lactuca sativa seeds and bioluminescent bacterium (Vibrio fischeri) have been carried out in order to quantify the toxicity of Norfloxacin (NOR) and sodium sulfate solutions, before and after treating them using electrochemical advanced oxidation. The effect of some process variables (anode material, reactor configuration and applied current) on the toxicity evolution of the treated solution has been studied. A NOR solution shows an EC50(5 days) of 336 mg L-1towards Lactuca sativa. This threshold NOR concentration decreases with sodium sulfate concentration, in solutions that contain simultaneously Norfloxacin and sodium sulfate. In every case considered in this work, the electrochemical advanced oxidation process increased the toxicity (towards both Lactuca sativa and Vibrio fischeri) of the solution. This toxicity increase is mainly due to the persulfate formation during the electrochemical treatment. From a final solution toxicity point of view, the best results were obtained using a BDD anode in a divided reactor applying the lowest current intensity.
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Affiliation(s)
- M T Montañés
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain.
| | - M García-Gabaldón
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain
| | - Ll Roca-Pérez
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain
| | - J J Giner-Sanz
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain
| | - J Mora-Gómez
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain
| | - V Pérez-Herranz
- IEC Group, ISIRYM, Universitat Politècnica de València, Camí de Vera s/n, 46022, València, P.O. Box 22012, E-46071, Spain
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O'Callaghan I, Harrison S, Fitzpatrick D, Sullivan T. The freshwater isopod Asellus aquaticus as a model biomonitor of environmental pollution: A review. CHEMOSPHERE 2019; 235:498-509. [PMID: 31276864 DOI: 10.1016/j.chemosphere.2019.06.217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 06/17/2019] [Accepted: 06/27/2019] [Indexed: 06/09/2023]
Abstract
Anthropogenic substances pollute freshwater systems worldwide, with serious, long-lasting effects to aquatic biota. Present methods of detecting elevated levels of trace metal pollutants are typically accurate but expensive, and therefore not suitable for applications requiring high spatial resolution. Additionally, these methods are not efficient solutions for the determination of long-term averages of pollution concentration. This is the rationale for the implementation of a biomonitoring programme as an alternative means of pollutant detection. This review summarises recent literature concerning the past and potential uses of the benthic isopod Asellus aquaticus as a biomonitor for pollution in freshwater systems. Recent studies indicate that A. aquaticus is well suited for this purpose. However, the mechanisms by which it bioaccumulates toxins have yet to be fully understood. In particular, the interactions between coexisting trace metal pollutants in the aquatic environment have only recently been considered, and it remains unclear how a biomonitoring programme should adapt to the effects of these interactions. It is evident that failing to account for these additional stressors will result in an ineffective biomonitoring programme; for this reason, a comprehensive understanding of the bioaccumulation mechanisms is required in order to reliably anticipate the effects of any interferences on the outcome.
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Affiliation(s)
- Irene O'Callaghan
- School of Biological, Earth & Environmental Sciences, University College Cork, Ireland; School of Chemistry, University College Cork, Ireland
| | - Simon Harrison
- School of Biological, Earth & Environmental Sciences, University College Cork, Ireland
| | | | - Timothy Sullivan
- School of Biological, Earth & Environmental Sciences, University College Cork, Ireland.
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Anyanwu BO, Ezejiofor AN, Igweze ZN, Orisakwe OE. Heavy Metal Mixture Exposure and Effects in Developing Nations: An Update. TOXICS 2018; 6:E65. [PMID: 30400192 PMCID: PMC6316100 DOI: 10.3390/toxics6040065] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/17/2018] [Accepted: 10/23/2018] [Indexed: 01/06/2023]
Abstract
The drive for development and modernization has come at great cost. Various human activities in developed and developing countries, particularly in sub-Saharan Africa (SSA) have given rise to environmental safety concerns. Increased artisanal mining activities, illegal refining, use of leaded petrol, airborne dust, arbitrary discarding and burning of toxic waste, absorption of production industries in inhabited areas, inadequate environmental legislation, and weak implementation of policies, have given rise to the incomparable contamination and pollution associated with heavy metals in recent decades. This review evaluates the public health effects of heavy metals and their mixtures in SSA. This shows the extent and size of the problem posed by exposure to heavy metal mixtures in regard to public health.
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Affiliation(s)
- Brilliance Onyinyechi Anyanwu
- World Bank Africa Centre of Excellence in Oilfield Chemicals Research, University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.
| | - Anthonet Ndidiamaka Ezejiofor
- Department of Experimental Pharmacology & Toxicology, Faculty of Pharmacy, University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.
| | - Zelinjo Nkeiruka Igweze
- Department of Experimental Pharmacology & Toxicology, Faculty of Pharmacy, Madonna University Elele, PMB, 5001 Elele, Rivers State, Nigeria.
| | - Orish Ebere Orisakwe
- Department of Experimental Pharmacology & Toxicology, Faculty of Pharmacy, University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.
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7
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Dalhoff K, Gottardi M, Rinnan Å, Rasmussen JJ, Cedergreen N. Seasonal sensitivity of Gammarus pulex towards the pyrethroid cypermethrin. CHEMOSPHERE 2018; 200:632-640. [PMID: 29510371 DOI: 10.1016/j.chemosphere.2018.02.153] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/19/2018] [Accepted: 02/24/2018] [Indexed: 06/08/2023]
Abstract
The aquatic toxicity of insecticides like the pyrethroids have been discussed intensively over the recent years especially in relation to risk assessment and how seasonality may or may not affect the sensitivity of non-target organisms. To address this issue, the crustacean Gammarus pulex was collected once a month for 16 months and acclimated to 10 °C for four days before being exposed to a 90 min pulse of cypermethrin. In vitro cytochrome P450 activity, total lipid content, total protein content, and dry weight were measured in male and female gammarids from each sampling date and used along with the water temperature as variables for sensitivity prediction by Partial Least Squares (PLS) regression models. The 24 h EC50-values varied more than 30 fold across the sampling period from 0.21 ± 0.05 μg L-1 (April 2015) to 6.60 ± 3.46 μg L-1 (October 2015), indicating seasonal variances in the acute sensitivity of G. pulex towards cypermethrin. After 168 h of recovery this difference in EC50-values was reduced to seven-fold. In both male and female gammarids seasonal patterns were observed in the total lipid content and in vitro CYP P450 activity, which peaked in spring and fall, respectively. The current study shows the importance of reporting time of organism collection and experimental execution for risk assessment of pyrethroids as season is important for the acute sensitivity of G. pulex. We suggest prolonged acclimation times of sampled macroinvertebrates to constant laboratory conditions in order to even out possible seasonal differences in sensitivity.
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Affiliation(s)
- Kristoffer Dalhoff
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Michele Gottardi
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
| | - Åsmund Rinnan
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
| | - Jes Jessen Rasmussen
- Department of Bioscience - Stream and Wetland Ecology, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Nina Cedergreen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
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Feng J, Gao Y, Ji Y, Zhu L. Quantifying the interactions among metal mixtures in toxicodynamic process with generalized linear model. JOURNAL OF HAZARDOUS MATERIALS 2018; 345:97-106. [PMID: 29131987 DOI: 10.1016/j.jhazmat.2017.11.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Revised: 11/02/2017] [Accepted: 11/06/2017] [Indexed: 06/07/2023]
Abstract
Predicting the toxicity of chemical mixtures is difficult because of the additive, antagonistic, or synergistic interactions among the mixture components. Antagonistic and synergistic interactions are dominant in metal mixtures, and their distributions may correlate with exposure concentrations. However, whether the interaction types of metal mixtures change at different time points during toxicodynamic (TD) processes is undetermined because of insufficient appropriate models and metal bioaccumulation data at different time points. In the present study, the generalized linear model (GLM) was used to illustrate the combined toxicities of binary metal mixtures, such as Cu-Zn, Cu-Cd, and Cd-Pb, to zebrafish larvae (Danio rerio). GLM was also used to identify possible interaction types among these method for the traditional concentration addition (CA) and independent action (IA) models. Then the GLM were applied to quantify the different possible interaction types for metal mixture toxicity (Cu-Zn, Cu-Cd, and Cd-Pb to D. rerio and Ni-Co to Oligochaeta Enchytraeus crypticus) during the TD process at different exposure times. We found different metal interaction responses in the TD process and interactive coefficients significantly changed at different exposure times (p<0.05), which indicated that the interaction types among Cu-Zn, Cu-Cd, Cd-Pb and Ni-Co were time dependent. Our analysis highlighted the importance of considering joint actions in the TD process to understand and predict metal mixture toxicology on organisms. Moreover, care should be taken when evaluating interactions in toxicity prediction because results may vary at different time points. The GLM could be an alternative or complementary approach for BLM to analyze and predict metal mixture toxicity.
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Affiliation(s)
- Jianfeng Feng
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
| | - Yongfei Gao
- Institute of Grassland Research, Chinese Academy of Agriculture Sciences, Hohhot 010010, China
| | - Yijun Ji
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Lin Zhu
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
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Lebrun JD, Uher E, Fechner LC. Behavioural and biochemical responses to metals tested alone or in mixture (Cd-Cu-Ni-Pb-Zn) in Gammarus fossarum: From a multi-biomarker approach to modelling metal mixture toxicity. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 193:160-167. [PMID: 29096089 DOI: 10.1016/j.aquatox.2017.10.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 10/23/2017] [Accepted: 10/24/2017] [Indexed: 06/07/2023]
Abstract
Metals are usually present as mixtures at low concentrations in aquatic ecosystems. However, the toxicity and sub-lethal effects of metal mixtures on organisms are still poorly addressed in environmental risk assessment. Here we investigated the biochemical and behavioural responses of Gammarus fossarum to Cu, Cd, Ni, Pb and Zn tested individually or in mixture (M2X) at concentrations twice the levels of environmental quality standards (EQSs) from the European Water Framework Directive. The same metal mixture was also tested with concentrations equivalent to EQSs (M1X), thus in a regulatory context, as EQSs are proposed to protect aquatic biota. For each exposure condition, mortality, locomotion, respiration and enzymatic activities involved in digestive metabolism and moult were monitored over a 120h exposure period. Multi-metric variations were summarized by the integrated biomarker response index (IBR). Mono-metallic exposures shed light on biological alterations occurring at environmental exposure levels in gammarids and depending on the considered metal and gender. As regards mixtures, biomarkers were altered for both M2X and M1X. However, no additive or synergistic effect of metals was observed comparing to mono-metallic exposures. Indeed, bioaccumulation data highlighted competitive interactions between metals in M2X, decreasing subsequently their internalisation and toxicity. IBR values indicated that the health of gammarids was more impacted by M1X than M2X, because of reduced competitions and enhanced uptakes of metals for the mixture at lower, EQS-like concentrations. Models using bioconcentration data obtained from mono-metallic exposures generated successful predictions of global toxicity both for M1X and M2X. We conclude that sub-lethal effects of mixtures identified by the multi-biomarker approach can lead to disturbances in population dynamics of gammarids. Although IBR-based models offer promising lines of enquiry to predict metal mixture toxicity, further studies are needed to confirm their predictive quality on larger ranges of metallic combinations before their use in field conditions.
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Affiliation(s)
- Jérémie D Lebrun
- Irstea, UR HBAN - Artemhys, CS 10030, 92761 Antony cedex, France; Federation of Research FIRE, FR-3020, 75005 Paris, France.
| | - Emmanuelle Uher
- Irstea, UR HBAN - Artemhys, CS 10030, 92761 Antony cedex, France; Federation of Research FIRE, FR-3020, 75005 Paris, France
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10
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Vu HT, Keough MJ, Long SM, Pettigrove VJ. Toxicological effects of fungicide mixtures on the amphipod Austrochiltonia subtenuis. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2017; 36:2651-2659. [PMID: 28370236 DOI: 10.1002/etc.3809] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 02/23/2017] [Accepted: 03/24/2017] [Indexed: 06/07/2023]
Abstract
Approaches to assess the toxicity of mixtures often use predictive models with acute mortality as an endpoint at relatively high concentrations. However, these approaches do not reflect realistic situations where organisms could be exposed to chemical mixtures over long periods at low concentrations at which no significant mortalities occur. The present study investigated chronic effects of 2 common fungicides, Filan® (active ingredient [a.i]) boscalid) and Systhane™ (a.i. myclobutanil), on the amphipod Austrochiltonia subtenuis at environmentally relevant concentrations under laboratory conditions. Sexually mature amphipods were exposed singly and in combination to Filan (1, 10, and 40 μg a.i./L) and Systhane (3 μg a.i./L) over 28 d. Survival, growth, a wide range of reproduction endpoints, and glutathione-S-transferase (GST) activity were measured at the end of the experiment. Both fungicides had significant independent effects on male growth, sex ratio, and juvenile size. Filan mainly affected female growth and the number of embryos per gravid female, whereas Systhane mainly affected the time for females to become gravid. The combined effects of these fungicides on numbers of gravid females and juveniles were antagonistic, causing a 61% reduction in the number of gravid females and a 77% reduction in the number of juveniles produced at the highest concentrations (40 μg a.i./L of boscalid and 3 μg a.i./L of myclobutanil) compared with the controls. There were no significant effects on survival or GST activity. The present study demonstrated that the effects of mixtures were endpoint dependent and that using a variety of endpoints should be considered for a comprehensive understanding of mixture effects. Also, chronic studies are more informative than acute studies for environmentally relevant fungicide concentrations. Environ Toxicol Chem 2017;36:2651-2659. © 2017 SETAC.
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Affiliation(s)
- Hung T Vu
- Centre for Aquatic Pollution Identification and Management, School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Michael J Keough
- Centre for Aquatic Pollution Identification and Management, School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Sara M Long
- Centre for Aquatic Pollution Identification and Management, School of BioSciences, The University of Melbourne, Victoria, Australia
| | - Vincent J Pettigrove
- Centre for Aquatic Pollution Identification and Management, School of BioSciences, The University of Melbourne, Victoria, Australia
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Driessnack MK, Jamwal A, Niyogi S. Effects of chronic exposure to waterborne copper and nickel in binary mixture on tissue-specific metal accumulation and reproduction in fathead minnow (Pimephales promelas). CHEMOSPHERE 2017; 185:964-974. [PMID: 28753743 DOI: 10.1016/j.chemosphere.2017.07.100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 06/27/2017] [Accepted: 07/13/2017] [Indexed: 05/21/2023]
Abstract
The current study evaluated the interactive effects of chronic waterborne copper (Cu) and nickel (Ni) exposure on tissue-specific metal accumulation and reproductive performance in fathead minnow (Pimephales promelas). Fish trios (1 male: 2 female; n = 5-6) were exposed for 21 days to: (i) control (no added Cu or Ni), (ii) waterborne Cu (45 μg/L), (iii) waterborne Ni (270 μg/L), and (iv) binary mixture of waterborne Cu and Ni (45 and 270 μg/L, respectively). Fish fecundity (cumulative egg production) was found to be the most sensitive reproductive endpoint, and the interaction of Cu and Ni elicited an additive effect on egg production. Tissue-specific accumulation of both metals was not influenced by the interaction of Cu and Ni, except an increased Cu and Ni burden in the carcass and ovary, respectively, were recorded. The expressions of hepatic estrogen receptor genes (ER-α and ER-β) and the circulating estradiol level in females were also not affected by the metal-mixture treatment. However, co-exposure to waterborne Cu and Ni resulted in a significant downregulation of the hepatic vitellogenin gene in females, which was associated with the maximum upregulation of the hepatic metallothionein gene. In addition, a significant alteration of ovarian histopathology (decreased abundance of post-vitellogenic follicles, and increased follicular atresia) was also observed only in females exposed to Cu and Ni in mixture. Collectively, these observations suggest that chronic waterborne exposure to Cu and Ni in binary mixture may impair fish reproductive capacity by inducing histopathological damage in ovarian tissue, and disrupting of energy homeostasis in fish.
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Affiliation(s)
- Melissa K Driessnack
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada
| | - Ankur Jamwal
- Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK, Canada
| | - Som Niyogi
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada; Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK, Canada.
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12
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Priac A, Badot PM, Crini G. Treated wastewater phytotoxicity assessment using Lactuca sativa: Focus on germination and root elongation test parameters. C R Biol 2017; 340:188-194. [PMID: 28256413 DOI: 10.1016/j.crvi.2017.01.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 01/06/2017] [Accepted: 01/10/2017] [Indexed: 10/20/2022]
Abstract
Sensitive and simple ecotoxicological bioassays like seed germination and root elongation tests are commonly used to evaluate the phytotoxicity of waste and industrial discharge waters. Although the tests are performed following national and international standards, various parameters such as the number of seeds per dish, the test duration or the type of support used remain variable. To be able to make a correct comparison of results from different studies, it is crucial to know which parameter(s) could affect ecotoxicological diagnosis. We tested four different control waters and three seed densities. No significant differences on either germination rate or root elongation endpoints were shown. Nevertheless, we found that the four lettuce cultivars (Appia, batavia dorée de printemps, grosse blonde paresseuse, and Kinemontepas) showed significantly different responses when watered with the same and different metal-loaded industrial discharge water. From the comparison, it is clear that a differential sensitivity scale occurs among not just species but cultivars.
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Affiliation(s)
- Anne Priac
- UMR 6249, Chrono-Environment, University of Franche-Comté/CNRS, 16, route de Gray, 25000 Besançon, France
| | - Pierre-Marie Badot
- UMR 6249, Chrono-Environment, University of Franche-Comté/CNRS, 16, route de Gray, 25000 Besançon, France
| | - Grégorio Crini
- UMR 6249, Chrono-Environment, University of Franche-Comté/CNRS, 16, route de Gray, 25000 Besançon, France.
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13
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Liu A, Li J, Li M, Niu XY, Wang J. Toxicity Assessment of Binary Metal Mixtures (Copper-Zinc) to Nitrification in Soilless Culture with the Extended Biotic Ligand Model. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2017; 72:312-319. [PMID: 28050624 DOI: 10.1007/s00244-016-0346-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 12/12/2016] [Indexed: 06/06/2023]
Abstract
Metals are always found in the environment as mixtures rather than as solitary elements. Only a limited number of studies have developed appropriate models that incorporate bioavailability to estimate the toxicity of heavy-metal mixtures. In the present study, we explored the applicability of two extended biotic ligand model (BLM) approaches-BLM-f mix and BLM-toxicity unit (TU)-to predict and interpret mixture toxicity with the assumption that interactions between metal ions obey the BLM theory. Exposure assays of single and mixed metals were performed with inoculums of an ammonia-oxidizing bacterium SD5 isolated from soil. Nitrification of the cultures was the end point used to quantify the toxic response. The results indicated that the developed BLM-f mix approach could well estimate the single toxicity of Cu2+ and Zn2+ as well as their binary mixture toxicity to nitrification with >90% of toxicity variation explained. Assuming that metal ions compete with each other for binding at a single biotic ligand, the BLM-f mix approach (root-mean-square error [RMSE] = 19.66, R 2 = 0.8879) showed better predictive power than the BLM-TU approach (RMSE = 31.12, R 2 = 0.6892). The present study supports the use of the accumulation of metal ions at the biotic ligands as predictor of toxicity of single metals and metal mixtures.
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Affiliation(s)
- Aiju Liu
- Shandong University of Technology, Zibo, 255049, China
| | - JinXin Li
- Shandong University of Technology, Zibo, 255049, China
| | - Menghong Li
- Shandong University of Technology, Zibo, 255049, China
| | - Xiao Yin Niu
- Shandong University of Technology, Zibo, 255049, China
| | - Jun Wang
- Key Laboratory of Agriculture Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China.
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14
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Taylor NS, Kirwan JA, Johnson C, Yan ND, Viant MR, Gunn JM, McGeer JC. Predicting chronic copper and nickel reproductive toxicity to Daphnia pulex-pulicaria from whole-animal metabolic profiles. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 212:325-329. [PMID: 26854702 DOI: 10.1016/j.envpol.2016.01.074] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/21/2016] [Accepted: 01/25/2016] [Indexed: 06/05/2023]
Abstract
The emergence of omics approaches in environmental research has enhanced our understanding of the mechanisms underlying toxicity; however, extrapolation from molecular effects to whole-organism and population level outcomes remains a considerable challenge. Using environmentally relevant, sublethal, concentrations of two metals (Cu and Ni), both singly and in binary mixtures, we integrated data from traditional chronic, partial life-cycle toxicity testing and metabolomics to generate a statistical model that was predictive of reproductive impairment in a Daphnia pulex-pulicaria hybrid that was isolated from an historically metal-stressed lake. Furthermore, we determined that the metabolic profiles of organisms exposed in a separate acute assay were also predictive of impaired reproduction following metal exposure. Thus we were able to directly associate molecular profiles to a key population response - reproduction, a key step towards improving environmental risk assessment and management.
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Affiliation(s)
- Nadine S Taylor
- Biology Department, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON, N2L 3C5, Canada; Vale Living with Lakes Centre, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON, P3E 2C6, Canada.
| | - Jennifer A Kirwan
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Craig Johnson
- Biology Department, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON, N2L 3C5, Canada
| | - Norman D Yan
- Department of Biology, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada
| | - Mark R Viant
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - John M Gunn
- Vale Living with Lakes Centre, Laurentian University, 935 Ramsey Lake Road, Sudbury, ON, P3E 2C6, Canada
| | - James C McGeer
- Biology Department, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON, N2L 3C5, Canada
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15
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Wu X, Cobbina SJ, Mao G, Xu H, Zhang Z, Yang L. A review of toxicity and mechanisms of individual and mixtures of heavy metals in the environment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:8244-59. [PMID: 26965280 DOI: 10.1007/s11356-016-6333-x] [Citation(s) in RCA: 497] [Impact Index Per Article: 62.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 02/21/2016] [Indexed: 04/16/2023]
Abstract
The rational for the study was to review the literature on the toxicity and corresponding mechanisms associated with lead (Pb), mercury (Hg), cadmium (Cd), and arsenic (As), individually and as mixtures, in the environment. Heavy metals are ubiquitous and generally persist in the environment, enabling them to biomagnify in the food chain. Living systems most often interact with a cocktail of heavy metals in the environment. Heavy metal exposure to biological systems may lead to oxidation stress which may induce DNA damage, protein modification, lipid peroxidation, and others. In this review, the major mechanism associated with toxicities of individual metals was the generation of reactive oxygen species (ROS). Additionally, toxicities were expressed through depletion of glutathione and bonding to sulfhydryl groups of proteins. Interestingly, a metal like Pb becomes toxic to organisms through the depletion of antioxidants while Cd indirectly generates ROS by its ability to replace iron and copper. ROS generated through exposure to arsenic were associated with many modes of action, and heavy metal mixtures were found to have varied effects on organisms. Many models based on concentration addition (CA) and independent action (IA) have been introduced to help predict toxicities and mechanisms associated with metal mixtures. An integrated model which combines CA and IA was further proposed for evaluating toxicities of non-interactive mixtures. In cases where there are molecular interactions, the toxicogenomic approach was used to predict toxicities. The high-throughput toxicogenomics combines studies in genetics, genome-scale expression, cell and tissue expression, metabolite profiling, and bioinformatics.
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Affiliation(s)
- Xiangyang Wu
- School of the Environment, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, Jiangsu, China.
| | - Samuel J Cobbina
- School of the Environment, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, Jiangsu, China
| | - Guanghua Mao
- School of the Environment, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, Jiangsu, China
| | - Hai Xu
- School of the Environment, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, Jiangsu, China
| | - Zhen Zhang
- School of the Environment, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, Jiangsu, China
| | - Liuqing Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Xuefu Rd. 301, Zhenjiang, 212013, China.
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16
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Lin X, Gu Y, Zhou Q, Mao G, Zou B, Zhao J. Combined toxicity of heavy metal mixtures in liver cells. J Appl Toxicol 2016; 36:1163-72. [PMID: 26865462 DOI: 10.1002/jat.3283] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 11/21/2015] [Accepted: 12/07/2015] [Indexed: 11/07/2022]
Abstract
With rapid industrialization, China is now facing great challenges in heavy metal contamination in the environment. Human exposure to heavy metals through air, water and food commonly involves a mixture consisting of multiple heavy metals. In this study, eight common heavy metals (Pb, Cd, Hg, Cu, Zn, Mn, Cr, Ni) that cause environmental contamination were selected to investigate the combined toxicity of different heavy metal mixtures in HL7702 cells. Toxicity (24 h LC50 ) of each individual metal on the cells ranked Hg > Cr = Cd > Cu > Zn > Ni > Mn > Pb; toxicity of the different mixtures ranked: M5 > M3PbHgCd > M5+Mn > M5+Cu > M2CdNi > M4A > M8-Mn > M8 > M5+Zn > M4B > M8-Cr > M8-Zn > M8-Cu > M8-Pb > M8-Cd > M8-Hg > M8-Ni > M3PbHgNi > M3CuZnMn. The cytotoxicity data of individual metals were successfully used to build the additive models of two- to eight-component metal mixtures. The comparison between additive model and combination model or partly additive model was useful to evaluate the combined effects in mixture. Synergistic, antagonistic or additive effects of the toxicity were observed in different mixtures. These results suggest that the combined effects should be considered in the risk assessment of heavy metal co-exposure, and more comprehensive investigations on the combined effects of different heavy metal mixtures are needed in the future. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Xialu Lin
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
- School of Public Health, Key Laboratory of Environment and Gene Related Diseases of Ministry of Education, Health Science Center, Xi'an Jiaotong University, No. 76 West Yanta Road, Xi'an, Shaanxi Province, 710061, People's Republic of China
| | - Yuanliang Gu
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Qi Zhou
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Guochuan Mao
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Baobo Zou
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
| | - Jinshun Zhao
- Department of Preventative Medicine, Zhejiang Provincial Key Laboratory of Pathological and Physiological Technology, School of Medicine, Ningbo University, 818 Fenghua Road, Ningbo, Zhejiang Province, 315211, People's Republic of China
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17
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Liu Y, Vijver MG, Qiu H, Baas J, Peijnenburg WJGM. Statistically significant deviations from additivity: What do they mean in assessing toxicity of mixtures? ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 122:37-44. [PMID: 26188643 DOI: 10.1016/j.ecoenv.2015.07.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 07/07/2015] [Accepted: 07/08/2015] [Indexed: 06/04/2023]
Abstract
There is increasing attention from scientists and policy makers to the joint effects of multiple metals on organisms when present in a mixture. Using root elongation of lettuce (Lactuca sativa L.) as a toxicity endpoint, the combined effects of binary mixtures of Cu, Cd, and Ni were studied. The statistical MixTox model was used to search deviations from the reference models i.e. concentration addition (CA) and independent action (IA). The deviations were subsequently interpreted as 'interactions'. A comprehensive experiment was designed to test the reproducibility of the 'interactions'. The results showed that the toxicity of binary metal mixtures was equally well predicted by both reference models. We found statistically significant 'interactions' in four of the five total datasets. However, the patterns of 'interactions' were found to be inconsistent or even contradictory across the different independent experiments. It is recommended that a statistically significant 'interaction', must be treated with care and is not necessarily biologically relevant. Searching a statistically significant interaction can be the starting point for further measurements and modeling to advance the understanding of underlying mechanisms and non-additive interactions occurring inside the organisms.
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Affiliation(s)
- Yang Liu
- Institute of Environmental Sciences (CML), Leiden University, 2300 RA Leiden, The Netherlands.
| | - Martina G Vijver
- Institute of Environmental Sciences (CML), Leiden University, 2300 RA Leiden, The Netherlands
| | - Hao Qiu
- Institute of Environmental Sciences (CML), Leiden University, 2300 RA Leiden, The Netherlands
| | - Jan Baas
- Centre for Ecology & Hydrology (CEH), MacLean Building, Benson Lane, OX10 8BB Wallingford, Oxfordshire, United Kingdom
| | - Willie J G M Peijnenburg
- Institute of Environmental Sciences (CML), Leiden University, 2300 RA Leiden, The Netherlands; National Institute of Public Health and the Environment (RIVM), Center for Safety of Substances and Products, 3720 BA Bilthoven, The Netherlands
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18
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Chiffre A, Degiorgi F, Morin-Crini N, Bolard A, Chanez E, Badot PM. PAH occurrence in chalk river systems from the Jura region (France). Pertinence of suspended particulate matter and sediment as matrices for river quality monitoring. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:17486-17498. [PMID: 26139398 DOI: 10.1007/s11356-015-4897-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 06/15/2015] [Indexed: 06/04/2023]
Abstract
This study investigates the variations of polycyclic aromatic hydrocarbon (PAH) levels in surface water, suspended particulate matter (SPM) and sediment upstream and downstream of the discharges of two wastewater treatment plant (WWTP) effluents. Relationships between the levels of PAHs in these different matrices were also investigated. The sum of 16 US EPA PAHs ranged from 73.5 to 728.0 ng L(-1) in surface water and from 85.4 to 313.1 ng L(-1) in effluent. In SPM and sediment, ∑16PAHs ranged from 749.6 to 2,463 μg kg(-1) and from 690.7 μg kg(-1) to 3,625.6 μg kg(-1), respectively. Investigations performed upstream and downstream of both studied WWTPs showed that WWTP discharges may contribute to the overall PAH contaminations in the Loue and the Doubs rivers. Comparison between gammarid populations upstream and downstream of WWTP discharge showed that biota was impacted by the WWTP effluents. When based only on surface water samples, the assessment of freshwater quality did not provide evidence for a marked PAH contamination in either of the rivers studied. However, using SPM and sediment samples, we found PAH contents exceeding sediment quality guidelines. We conclude that sediment and SPM are relevant matrices to assess overall PAH contamination in aquatic ecosystems. Furthermore, we found a positive linear correlation between PAH contents of SPM and sediment, showing that SPM represents an integrating matrix which is able to provide meaningful data about the overall contamination over a given time span.
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Affiliation(s)
- Axelle Chiffre
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France
| | - François Degiorgi
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France
| | - Nadia Morin-Crini
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France
| | - Audrey Bolard
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France
| | - Etienne Chanez
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France
| | - Pierre-Marie Badot
- University of Bourgogne Franche-Comté, Chrono-environnement, UMR 6249 UFC/CNRS usc INRA, 16 route de Gray, 25030, Besançon cedex, France.
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19
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Rodea-Palomares I, González-Pleiter M, Martín-Betancor K, Rosal R, Fernández-Piñas F. Additivity and Interactions in Ecotoxicity of Pollutant Mixtures: Some Patterns, Conclusions, and Open Questions. TOXICS 2015; 3:342-369. [PMID: 29051468 PMCID: PMC5606646 DOI: 10.3390/toxics3040342] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/09/2015] [Accepted: 09/23/2015] [Indexed: 11/16/2022]
Abstract
Understanding the effects of exposure to chemical mixtures is a common goal of pharmacology and ecotoxicology. In risk assessment-oriented ecotoxicology, defining the scope of application of additivity models has received utmost attention in the last 20 years, since they potentially allow one to predict the effect of any chemical mixture relying on individual chemical information only. The gold standard for additivity in ecotoxicology has demonstrated to be Loewe additivity which originated the so-called Concentration Addition (CA) additivity model. In pharmacology, the search for interactions or deviations from additivity (synergism and antagonism) has similarly captured the attention of researchers over the last 20 years and has resulted in the definition and application of the Combination Index (CI) Theorem. CI is based on Loewe additivity, but focused on the identification and quantification of synergism and antagonism. Despite additive models demonstrating a surprisingly good predictive power in chemical mixture risk assessment, concerns still exist due to the occurrence of unpredictable synergism or antagonism in certain experimental situations. In the present work, we summarize the parallel history of development of CA, IA, and CI models. We also summarize the applicability of these concepts in ecotoxicology and how their information may be integrated, as well as the possibility of prediction of synergism. Inside the box, the main question remaining is whether it is worthy to consider departures from additivity in mixture risk assessment and how to predict interactions among certain mixture components. Outside the box, the main question is whether the results observed under the experimental constraints imposed by fractional approaches are a de fide reflection of what it would be expected from chemical mixtures in real world circumstances.
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Affiliation(s)
- Ismael Rodea-Palomares
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid E-28049, Spain.
| | - Miguel González-Pleiter
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid E-28049, Spain.
| | - Keila Martín-Betancor
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid E-28049, Spain.
| | - Roberto Rosal
- Departamento de Ingeniería Química, Universidad de Alcalá, Alcalá de Henares, Madrid E-28871, Spain.
| | - Francisca Fernández-Piñas
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid E-28049, Spain.
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20
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Calomeni AJ, Iwinski KJ, Kinley CM, McQueen A, Rodgers JH. Responses of Lyngbya wollei to algaecide exposures and a risk characterization associated with their use. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 116:90-8. [PMID: 25770656 DOI: 10.1016/j.ecoenv.2015.03.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 03/04/2015] [Accepted: 03/05/2015] [Indexed: 05/12/2023]
Abstract
To make informed decisions regarding management of noxious algal growths, water resource managers require information on responses of target and non-target species to algaecide exposures. Periodic treatments of Phycomycin®-SCP (sodium carbonate peroxyhydrate) followed by Algimycin®-PWF (gluconate and citrate chelated copper) to control Lyngbya wollei growths for ten years provided an opportunity for a risk evaluation of treated coves in Lay Lake, AL. Abiotic sediment characteristics (acid soluble copper concentrations, acid volatile sulfides, percent organic matter and cation exchange capacity) and survival of Hyalella azteca and Chironomus dilutus were measured in sediment samples from treated and untreated coves to assess the bioavailability of potential copper-residuals. In laboratory studies to seek a more effective approach for managing the growth of Lyngbya, six algaecide treatments consisting of combinations of copper-based algaecides (Cutrine®-Ultra, Clearigate® and Algimycin®- PWF), a hydrogen peroxide based algaecide (Phycomycin®-SCP) and an adjuvant (Cide-Kick II) were assessed for efficacy in controlling L. wollei sampled from Lay Lake. The most efficient algaecide treatment was determined based on post-treatment algal wet weight and visual observations of responses to exposures. To estimate the margin of safety for non-target organisms, Pimephales promelas was exposed to the most efficacious treatment and a treatment of Phycomycin®-SCP followed by Algimycin®-PWF. Results from sediment experiments demonstrated that there were no measureable copper residuals and no adverse effects on H. azteca and C. dilutus from sediments following ten years of copper-based algaecide treatments. Based on the laboratory results, a treatment of Phycomycin®-SCP at 10.1 mg H2O2/L followed by Cide-Kick II at 0.2 mg/L and Algimycin®- PWF at 0.26 mg Cu/L could control the growth of Lyngbya wollei from Lay Lake, AL and enhance the margin of safety for non-target species (e.g. P. promelas).
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Affiliation(s)
- Alyssa J Calomeni
- School of Agricultural, Forest and Environmental Sciences, Clemson University, 261 Lehotsky Hall, Clemson University, Clemson, SC 29634-0001, USA.
| | - Kyla J Iwinski
- School of Agricultural, Forest and Environmental Sciences, Clemson University, 261 Lehotsky Hall, Clemson University, Clemson, SC 29634-0001, USA
| | - Ciera M Kinley
- School of Agricultural, Forest and Environmental Sciences, Clemson University, 261 Lehotsky Hall, Clemson University, Clemson, SC 29634-0001, USA
| | - Andrew McQueen
- School of Agricultural, Forest and Environmental Sciences, Clemson University, 261 Lehotsky Hall, Clemson University, Clemson, SC 29634-0001, USA
| | - John H Rodgers
- School of Agricultural, Forest and Environmental Sciences, Clemson University, 261 Lehotsky Hall, Clemson University, Clemson, SC 29634-0001, USA
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